Pump



v. H. FRANCIS.

PUMP.

APPLICATION FILED JUNE 23, I917.

UNITED STATES PATENT OFFICE.

VINCENT FRANCIS, OFDR UMR'IGHT; OKLAHOMA, ASSIGNOR T0 FRICK-REID SUPPLY COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENN SYLVA'NIA" PUMP.

Specification of Letters Patent.

Patented Apr. 20,1920.

Application filed June 23, 1917.- Serial No..1' 76,558.

To all whomz't may concern:

Be it known .that I, VINCENT H. FRANCIS,

a citizen of the United States, and resident like wells, the objectvofwhich is to provide a simple form of pump whichis adapted particularly, though not exclusively, for pumping operation: by wirerope or pumprod connection to the pumping, apparatus, in which a'highenrate ofispeedin operation may be attained as compared with the pumps now generally employed using. like cable or pump-rod connections.

In wells of limited production, the pumping operation asnow practised is performed at a considerablev loss, the apparatus employed in pumping these wells being generally the same as used in'pumping wells of greater production, and the work performed is the same in each case, but with aless volume of fluid pumped perhour'in the limited producing wells. Besides the loss of time in pumping, the apparatus is subjected to abnormal strains,.such as slack in the cable, due to compression in the pump chamber, causing back-lash.

My invention has special advantages adapting it for use in wells of limited production, as the pumping may be accomplished more rapidly and with little wear to the apparatus, and in which the wire-rope or rods may be maintained always taut.

The invention consists in the novel construction as hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a longitudinal section of my improved pump; and Fig. 2 is an enlarged view of one of the valves employed.

The numeral 2 indicates the pump-barrel or pump-cylinder corresponding generally in its function, and in regard to its position in the well, to the ordinary working barrel of regular pumping apparatus. This cylinder is provided with the usual anchor tubing and strainer 3, and has a piston I, which is connected to the operating cable or pump-rod'(not shown) by a piston-rod i which passes through a striding-box 5 at the upper end of the cylinder. The stuffing-box, is preferably frictionall'y seatedat the coupling. 6, which connects the barrel to a section of tubing-7. Asoli'd diaphragm or wall 8 closes thelower end ofithe cylinder below the maximum travel ofthe piston forming. a vacuum chamber 2 beneath thepiston.

The tubing 7 may be only. a section of tubing connecting with the well-tubing (not shown), and it maybe the lower end of thew well tubing, also the structure including this section and the barrel and thestrainer section maybe formed as a. single member such as a casting or the like, and I do not wish to limit the form of construction to that shown and described. A fiuid-by-pass 9.;connects with the ancho'r'tubing below thestrainer openings'at 10, and connects with the workingbarrel or cylinder at a, point 11 above the maximum upward travel of the piston. This pipe is provided with a downwardlyseating check-valve 12 and is. formedwith a slip-joint connection 13.

The functionofthis by-pass is to admit fluid to the working-barrel of'th'e pump on the down-stroke of the piston as hereinafter described.

The fluid outlet of the barrel is at a point above the maximum upward travel of the piston, and in this instance the opening 11 is employed; fluid by displacement of the piston is forced through this opening and into a by-pass pipe connection 14, which communicates with the well-tubing above the stufling-boX 5. A downwardly-seating check-valve 15 in this pipe closes to fluid communication between the well-tubing and the working-barrel on the down-stroke of the piston, this valve and a slip-joint connection 16 being in structure similar to the valve 12 and slip-joint 13 respectively.

An enlarged view in section of the valves and the slip-joints is shown in Fig. 2. The structure of the valve forms the subject of separate application for Letters Patent, Serial No. 176,559, filed by me of even date herewith, and is illustrated with this invention only as a preferable form of construction, and I do not wish'to confine my invention to any particular form of valves employed, nor do I wish to limit my invention to the manner of arrangement of the bypass connections; as is obvious, pipes may be arranged differently which would function in a similar manner, for instance,

ton. into the pump chamber and discharged the by-pass connections may be formed so that the intake and outlet pipes be separate and distinct connections, and they may be formed integrally with the pumping barrel such as in a casting.

In the operation of my improved pump, on the down-stroke of the piston fluid is drawn into the chamber above the piston through by-pass pipe 9, suction being created in the chamber by the piston and closing the check-valve at the beginning of the pistons movement. Upward movement of the piston forces this fluid through the I inlet opening of the chamber into by-pass 15 pipe 14 through check-valve 15, and into the well tubing above the stufling-box; the check-valve 12 in pipe 9 closing at beginning of the upward movement of the pis- It will thus be seen, fluid is drawn therefrom only from above the piston, leaving that portion of the chamber beneath the piston unobstructed for the free downward niovement of the piston, the downward movement being greatly facilitated as the chamber beneath the piston formed by the wall 8 provides a vacuum chamber which effects in a manner which is well understood, a downward pull of the piston, and by reason of which a uniform tension of the pumping cable or rods is maintained in the downward movement, thus preventing slack in the cable or rods and doing away with the necessity of employment of weights and the like.

From the foregoing description it will be seen that I have provided a simple form of I chambers by means of an imperforate closure, a piston working tightly within the said upper chamber and a valved by-pass communicating with the said lower chamber and also communicating withthe said upper chamber above the said piston.

52. A pump for oil or other fluid comprising an elongated tube of substantially uni form bore divided into upper and, lower chambersby means of an imperforate 010-- sure, a piston working tightly within the said upper chamber, a valved by-pass communicating with the said lower chamber and also communicating with the said upper chamber above the said piston, and means kfsor admitting fluid to the said lower cham- In testimony whereof, I the said VINCENT H. FRANCIS, have hereunto set my hand.

VINCENT H. FRANCIS.

Witnesses GRAcE Hoo'roN, MABEL HERMES. 

